Browse > Article
http://dx.doi.org/10.9725/kts.2018.34.3.93

Wear Analysis of Engine Bearings at Constant Shaft Angular Speed on a Firing State - Part I: Understanding of Bearing Wear Region  

Chun, Sang Myung (School of Mechanical Engineering, Dept. of Automotive Engineering, Hoseo University)
Publication Information
Tribology and Lubricants / v.34, no.3, 2018 , pp. 93-107 More about this Journal
Abstract
The purpose of Part I of this study is to find the potential region of wear scarring on engine journal bearings operating at a constant angular crank shaft velocity under firing conditions. To do this, we calculate the applied loads and eccentricities of a big-end journal bearing installed on a four-stroke and four-cylinder engine at every crank angle. Then, we find potential wear regions, such as a minimum oil film thickness, at every crank angle below most oil film thickness scarring wear (MOFTSW) obtained based on the concept of the centerline average surface roughness. Thus, the wear region is defined as a set of each film thickness below the MOFTSW at every crank angle. In this region, the wear volume changes according to the wear depth and wear angle, depending on the minimum oil film thickness at every crank angle. The total wear volume is the summation during one cycle. Graphical views of the region in the two-dimensional coordinates show the crank angle and bearing angle along the journal center path, indicating the position of the minimum oil film thickness. The results of wear analysis show that the possible wear region is located at a few tens of angles behind the upper center of a big-end bearing at maximum power rpm.
Keywords
firing operating condition; bearing loads of a four-cylinder-engine; constant angular velocity of a crank-shaft; relative angular velocity of a crank-pin; most oil film thickness scaring wear;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Chun, S. M., Khonsari, M. M., "Wear simulation for the journal bearings operating under aligned shaft and steady load during start-up and coast-down conditions", Tribology International, No. l. 97, 440-466, http://dx.doi.org/10.1016/j.triboint.2016.01.042, 2016.   DOI
2 Chun, S. M., Parametric Study of Thermal and Unsteady Effects in Hydrodynamic Lubrication of Journal Bearings, Ph. D. thesis, Wayne State University, Detroit, Michigan, 1989.
3 Booker, J. F., "Dynamically-loaded journal bearings: Mobility method of solution", Trans. of the ASME, J. Basic Engineering, Vol. 87, pp. 537-546, 1965.   DOI
4 Booker, J. F., "Dynamically-Loaded Journal Bearings: Numerical Application of the Mobility Method", Trans. the ASME, J. Lubrication Technology, Vol. 93, No. 1, pp. 168-176, 1971, Errata: No. 2, April 1971, pp. 315.   DOI
5 Lu, X., Khonsari, M. M., "On the Lift-Off speed in journal bearings", Tribol. Lett., Vol. 20, Nos. 3-4, pp. 299-305, DOI: 10.1007/s11249-005-9124-y, 2005.   DOI
6 Chun S. M., Lalas, D. P., "Parametric study of inlet oil temperature and pressure for a Half-Circumferential grooved journal bearing", Tribol. Trans., Vol. 35, No. 2, pp. 213-224, 1992.   DOI
7 Chun S. M., "Aeration effects on the performance of a turbocharger journal bearing", Tribol. Int., Vol. 41, pp. 296-306, DOI: 10.1016/j.triboint.2007.08.006, 2008.   DOI
8 Ligterink, D. J., de Gee, A. W. J., "Measurements of wear in radial journal bearings", Tribotest Journal, Vol. 3, No. 1, pp. 45-54, 1354-4063, 1996.   DOI
9 Chun, S. M., "Wear analysis of the journal bearings operating under misaligned shaft during motoring start-up and coast-down conditions - Part I: Study on the change in oil film thickness at the potential region involved wear", J. Korean Soc. Tribol. Lubr. Eng., Vol. 33, No. 4, 153-167, 2017.
10 Chun, S. M., "Wear analysis of the journal bearings operating under misaligned shaft during motoring start-up and coast-down conditions - Part II: Wear analysis of two journal bearings supporting for and operating under misaligned shaft", J. Korean Soc. Tribol. Lubr. Eng., Vol. 33, No. 4, 168-186, 2017.
11 Chun, S. M., "Wear analysis of engine bearings at constant shaft angular velocity on a firing state - Part II: Calculation of the wear amount on journal bearings", Tribol. Lubr., Vol. 34, No. 4, To be published, 2018.